Two things work for me, either reading on my phone (I have a support thing) with the eye shield to avoid the blue light or listening to music until I feel sleepy enough to stop.
When it comes to bedtime reading, I found that nothing beats an OLED smartphone so long as you can fully control the brightness and the colors; e.g. a reading app that lets you set whatever you want - i.e. not Kindle - or else things like "color calibration" in GrapheneOS. That way, you can set the text to dull orange or red and dial the brightness very low. With OLED, the blacks are basically non-emissive, so the whole thing can be made extremely little light. This works even better if you gradually dial it down as your eyes get accommodated.